PDF Publication Title:
Text from PDF Page: 505
9/8/98 AC 43.13-1B SECTION 4. INSPECTION OF CIRCUIT-PROTECTION DEVICES 11-47. GENERAL. All electrical wires must be provided with some means of circuit protection. Electrical wire should be protected with circuit breakers or fuses located as close as possible to the electrical power source bus. Normally, the manufacturer of electrical equipment will specify the fuse or breaker to be used when installing the respective equip- ment, or SAE publication, ARP 1199, may be referred to for recommended practices. 11-48. DETERMINATION OF CIRCUIT BREAKER RATINGS. Circuit protection devices must be sized to supply open circuit capability. A circuit breaker must be rated so that it will open before the current rating of the wire attached to it is exceeded, or before the cumulative rating of all loads connected to it are exceeded, whichever is lowest. A circuit breaker must always open before any compo- nent downstream can overheat and generate smoke or fire. Wires must be sized to carry continuous current in excess of the circuit protective device rating, including its time- current characteristics, and to avoid excessive voltage drop. Refer to section 5 for wire rating methods. 11-49. DC CIRCUIT PROTECTOR CHART. Table 11-3 may be used as a guide for the selection of circuit breaker and fuse rating to protect copper conductor wire. This chart was prepared for the conditions speci- fied. If actual conditions deviate materially from those stated, ratings above or below the values recommended may be justified. For ex- ample, a wire run individually in the open air may possibly be protected by the circuit breaker of the next higher rating to that shown on the chart. In general, the chart is conserva- tive for all ordinary aircraft electri- cal installations. TABLE 11-3. DC wire and circuit protector chart. Wire AN gauge copper Circuit breaker amp. Fuse amp. 22 20 18 16 14 12 10 8 6 4 2 1 0 5 7.5 10 15 20 30 40 50 80 100 125 5 5 10 10 15 20 30 50 70 70 100 150 150 Basis of chart: (1) Wire bundles in 135 °F. ambient and altitudes up to 30,000 feet. (2) Wire bundles of 15 or more wires, with wires carrying no more than 20 percent of the total current carrying capacity of the bundle as given in Specification MIL-W-5088 (ASG). (3) Protectors in 75 to 85 °F. ambient. (4) Copper wire Specification MIL-W-5088. (5) Circuit breakers to Specification MIL-C-5809 or equivalent. (6) Fuses to Specification MIL-F-15160 or equivalent. Par 11-47 Page 11-15 11-50. RESETTABLE CIRCUIT PRO- TECTION DEVICES. a. All resettable type circuit breakers must open the circuit irrespective of the posi- tion of the operating control when an overload or circuit fault exists. Such circuit breakers are referred to as “trip free.” b. Automatic reset circuit breakers, that automatically reset themselves periodically, are not recommended as circuit protection devices for aircraft. 11-51. CIRCUIT BREAKER USAGE. Circuit breakers are designed as circuit protec- tion for the wire (see paragraph 11-48 and 11-49), not for protection of black boxesPDF Image | AFS-640
PDF Search Title:
AFS-640Original File Name Searched:
ac_43.13-1b_w-chg1.pdfDIY PDF Search: Google It | Yahoo | Bing
5,000 BF Shipping Container Lumber Dry Kiln For Quality Lumber The 5,000 BF container kiln consists of one 40 foot high-cube aluminum shipping container... More Info
Shipping Container Lumber Dry Kilns by Global Energy Global Energy designed and developed the container kiln back in 1991. The purpose is to give access to portable sawmill owners, furniture makers, and small business the value added profit of dry kiln lumber and quality hardwoods... More Info
Vacuum Kiln Conversion Kit for Lumber and Wood Dry Kilns Convert your existing conventional dry kiln into a fast drying vacuum kiln. Similar to vacuum bagging in the boat building and aircraft industry, we have come up with a proprietary process which allows you to build a very simple vacuum kiln at a fraction of the price, and without the intensive conventional metal chamber structure... More Info
Vacuum Pump Cart System for Bagging Clamping Wood Drying and more Vacuum Cart with 2HP Pump and Dual Pistons with multiple multiplex vacuum ports and liquid reservoir... More Info
Vacuum Bagging Basics Vacuum bagging is a method of clamping, which has traditionally been used in the composites industry, but can also be used for vacuum drying materials, including wood products... More Info
CONTACT TEL: 608-238-6001 Email: greg@globalmicroturbine.com (Standard Web Page)